Pipe-wrench



v(No Model.) Y

T. W FISHER.

PIPE WRENCH.'

Patented Feb. 18, 1890.

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TIIOMAS WHITE FISHER, OF HELENA, MONTANA.

PIPE-WRENCH.

SPECIFICATION forming part of Letters Patent No. 421,688, dated February18, 1890.

Application filed March 19, 1889.

To all whom it may concern:

Be it known that I, THOMAS WHITE FISHER, of Helena, in the county ofLewis and Clarke and State of Montana, have invented a new and usefulImprovement in Pipe-Vtfrenches, of which the following is a full, clear,and exact description.

The invention relates to improvements in pipe-wrenches; andit consistsin the particular construction and arrangement of parts, as hereinafterfully described, and pointed out in the claim.

Reference is to be had to the accompanying` drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the gures.

Figure 1 represents a longitudinal view of the wrench as seen from itsside with certain parts broken away and in section toy more clearlyillustrate the construction. Fig. 2 is a view of the sliding jaw-head ofthe wrench, looking toward the shank or stock of the latter; and Fig. 3is a partly-sectional view upon the line c in Fig. l, looking toward thesliding jaw-head.

Aindicates the shank or stock of the Wrench constructed at its forwardend to form a stationary serrated jaw B.

C is the adjustable jaw-head, having a serrated jaw-piece C in front,facingvthe jaw B, and which may either be of one piece with the jaw-headC or not. This jaw-head C is iitted to slide on or along the shank A,and is moved along the same by a rack-bar D, connected with it. Thisbar, which is iitted to slide upon the shank A, is pivoted at its innerend bya pin bto a handle G, which in its turn is pivoted to the stock A,as by a pin c, to one side of the pin b. Said handle maybe of anydesired length-the longer, consistent with convenience, the better*andwhen it is required to convert it into ay longer lever, a bar for thepurpose may be inserted within a hole d in the back end of the handle.This hinge or pivoted handle forms a lever by which to throw therack-barD backward and forwardacc'ording to the direction in which saidhandle is vibrated, as shown by full and dotted lines in Fig. 1,7and thegreater the force exerted on the handle to move the rackbar so that thejaws of the wrench will be brought closer together the tighter will theSerial No. 303,837x (No model.)

jaws, after being set to the pipe or body under operation, grip suchbody.

The j aw-head C is connected with the rackbar D by or through theintervention of an automatically-locking toothed catch E, pivoted, as atc, to the jaw-head C, within which it is arranged, and acted upon by anexterior thumb-piece f, to disengage it from the rack- 'bar D when it isrequired to independently slide or adjust the j aw-head C up to its Workor to gage the jaws, as it were, for the work before Working orstraining on the handlelever, and slightly moving it on its pivot c togive the necessary grip. Thus the sliding jaw-head C, when disengagedfrom the rackbar, should be capable of moving a certainl distance alongthe shank A to bring it near or close to the work, but, as the ratchet`catch E is engaged with the rack-bar, leaving a short distance yet Jforthe sliding jawhead C, by its jaw C', to move up through the action ofthe lever-handle G and firmly grip the pipe or work between the jawsB C.

The independent adj ustability of the sliding jaw-head C provides forquickly adjust# ing the wrench to its work. Vhen the wrench is beingworked, the strain, it Will be observed, is exerted against the end vot'the sliding rack-bar as it bears up against a shoulder g on the shank,and is transferred to the pivot-pin c ot the handle-lever G, whichreally carries the whole strain. The smaller pin l), which connects therack-bar to the handle, has only to draw the sliding jaw back.

The teeth of the catch E and the teeth of l.

suitable spring can be used to act upon the toothed catch E.

In applying the wrench, suppose it to be held in the hand With the jawsuppermost. Then by pressing slightly on the thumb-piece f of the catch Esaid catch will be released IOO In a Wrench, the combination, withashank having a stationary jaw at its forward end, a sliding rack on theshank, and a handle pivoted to the said shank and rack, of a recessedmovable jaw fitted to slide on the shank, a pivoted and toothed catch inthe rccess of the movable jaw and provided with a thumb-piece, and aspring for pressing the catch into engagement With the rack,substantially as herein shown and described.

THOMAS W. FISHER.

4 Vitnesses:

F. REBER MUssER, JACOB J. Lmsnn.

